<?php

class dbf_class
{
    var $dbf_num_rec; // Number of records in the file
    var $dbf_num_field; // Number of columns in each row
    var $dbf_names = array(); // Information on each column ['name'],['len'],['type']
                              // These are private....
    var $_raw; // The raw input file
    var $_rowsize; // Length of each row
    var $_hdrsize; // Length of the header information (offset to 1st record)
    var $_memos; // The raw memo file (if there is one).
    function dbf_class($filename)
    {
        if (! file_exists($filename)) {
            echo 'Not a valid DBF file !!!(1)';
            exit();
        }
        $tail = substr($filename, - 4);
        if (strcasecmp($tail, '.dbf') != 0) {
            echo 'Not a valid DBF file !!!';
            exit();
        }

        // Read the File
        $handle = fopen($filename, "r");
        if (! $handle) {
            echo "Cannot read DBF file - tutaj";
            exit();
        }
        $filesize = filesize($filename);
        $this->_raw = fread($handle, $filesize);
        fclose($handle);
        // Make sure that we indeed have a dbf file...
        if (! (ord($this->_raw[0]) == 3 || ord($this->_raw[0]) == 131) && ord($this->_raw[$filesize]) != 26) {
            echo 'Not a valid DBF file !!!';
            exit();
        }
        // 3= file without DBT memo file; 131 ($83)= file with a DBT.
        $arrHeaderHex = array();
        for ($i = 0; $i < 32; $i ++) {
            $arrHeaderHex[$i] = str_pad(dechex(ord($this->_raw[$i])), 2, "0", STR_PAD_LEFT);
        }
        // Initial information
        $line = 32; // Header Size
                    // Number of records
        $this->dbf_num_rec = hexdec($arrHeaderHex[7] . $arrHeaderHex[6] . $arrHeaderHex[5] . $arrHeaderHex[4]);
        $this->_hdrsize = hexdec($arrHeaderHex[9] . $arrHeaderHex[8]); // Header Size+Field Descriptor
                                                                    // Number of fields
        $this->_rowsize = hexdec($arrHeaderHex[11] . $arrHeaderHex[10]);
        $this->dbf_num_field = floor(($this->_hdrsize - $line) / $line); // Number of Fields

        // Field properties retrieval looping
        for ($j = 0; $j < $this->dbf_num_field; $j ++) {
            $name = '';
            $beg = $j * $line + $line;
            for ($k = $beg; $k < $beg + 11; $k ++) {
                if (ord($this->_raw[$k]) != 0) {
                    $name .= $this->_raw[$k];
                }
            }
            $this->dbf_names[$j]['name'] = $name; // Name of the Field
            $this->dbf_names[$j]['len'] = ord($this->_raw[$beg + 16]); // Length of the field
            $this->dbf_names[$j]['type'] = $this->_raw[$beg + 11];
        }
        /*
         * if (ord($this->_raw[0])==131) { //See if this has a memo file with it... //Read the File $tail=substr($tail,-1,1); //Get the last character... if ($tail=='F'){ //See if upper or lower case $tail='T'; //Keep the case the same } else { $tail='t'; } $memoname = substr($filename,0,strlen($filename)-1).$tail; $memoname = $filemane; echo $memoname.'<br>'; $handle = fopen($memoname, "r"); if (!$handle) { echo "Cannot read DBT file - tutaj"; exit; } $filesize = filesize($memoname); $this->_memos = fread ($handle, $filesize); fclose ($handle);
         */
    }

    function getRow($recnum)
    {
        $memoeot = chr(26) . chr(26);
        $rawrow = substr($this->_raw, $recnum * $this->_rowsize + $this->_hdrsize, $this->_rowsize);
        $rowrecs = array();
        $beg = 1;
        if (ord($rawrow[0]) == 42) {
            return false; // Record is deleted...
        }
        for ($i = 0; $i < $this->dbf_num_field; $i ++) {
            $col = trim(substr($rawrow, $beg, $this->dbf_names[$i]['len']));
            if ($this->dbf_names[$i]['type'] != 'M') {

                $rowrecs[] = $col;
            } else {
                $memobeg = $col * 512; // Find start of the memo block (0=header so it works)
                $memoend = strpos($this->_memos, $memoeot, $memobeg); // Find the end of the memo
                $rowrecs[] = substr($this->_memos, $memobeg, $memoend - $memobeg);
            }
            $beg += $this->dbf_names[$i]['len'];
        }
        return $rowrecs;
    }

    function getRowAssoc($recnum)
    {
        $rawrow = substr($this->_raw, $recnum * $this->_rowsize + $this->_hdrsize, $this->_rowsize);
        $rowrecs = array();
        $beg = 1;
        if (ord($rawrow[0]) == 42) {
            return false; // Record is deleted...
        }
        for ($i = 0; $i < $this->dbf_num_field; $i ++) {
            $col = trim(substr($rawrow, $beg, $this->dbf_names[$i]['len']));
            if ($this->dbf_names[$i]['type'] != 'M') {
                $rowrecs[$this->dbf_names[$i]['name']] = $col;
            } else {
                $memobeg = $col * 512; // Find start of the memo block (0=header so it works)
                $memoend = strpos($this->_memos, $memoeot, $memobeg); // Find the end of the memo
                $rowrecs[$this->dbf_names[$i]['name']] = substr($this->_memos, $memobeg, $memoend - $memobeg);
            }
            $beg += $this->dbf_names[$i]['len'];
        }
        return $rowrecs;
    }

}